When does it fail?
Does the light flicker when you switch box?
Does the box appear as wifi connection?
When you log in does it see box?
When select box fan you get setup details?
Is it only the TV picture you cannot see?
Check power on for unit.
Check wifi signal for unit
Check wifi connection for phone
Check you selected right box
Check which connectirs you have used
Check output from source you have selected.. Sd is RCA composite with Y for video. Check out set to NTSC or PAL on source.
Is SD you want a pal or nysc output using composite audio and video (3 leads) connected same colors in in on slingbox (not out)
Then confihure box for sd
Then log into slingbox set up as sd and should work.